Oliver r



(No Model.) I

0. R. BUTLER.

BOLT, BAR, $50.

No 391,879. Patented Oct. 30, 1888.

INVENTOR ATTORNEYS.

UNITED STATES PATENT 1 tries.

OLIVER R. BUTLER, OF OOOPERSTOXVN, NEW YORK.

BOLT, BAR, 8w.

SPECIFICATION forming part of Letters Patent No. 391,879, dated October 30, 1888,

Application filed June 4, 1888.

To all whom, it may concern.-

Be it known that l, OLIVER R. BUTLER, of Cooperstown, in the county of Otsego and State of New York, have invented a new and useful Improvement in Bolts, Bars, &c., of which the following is a full, clear, and exact description.

My invention consists in applying to the ordinary bolts or bars used in prisons and other places an outside enamel or glaze of some hard substance similar to that used on what is called agate ware or any other vitreous substance which will resist asaw or file. Over this is to be placed a sleeve or jacket of metal J to protect the enamel, the object being to thwart all attempts to cut the bolts or bars.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 illustrates one use of the bars made in accordance with my invention. Fig. 2 isa broken perspective of one end of a bolt made in accordance with my invention. Fig. 3 is an enlarged cross-section of one of the bars, and Fig. 4 is a perspective view of a corn mon screw-bolt, having my invention applied thereto.

A represents a sliding bolt for a lock covcred with a coating, (1, of glazing or enamel.

Serial No. 276,007. (No model.)

Over this coating a is placed a metal sleeve or jacket, b,which protects the enamel. The bar B may be made square or of any form in crossscction and of any size and length. It is coated upon its outer surface with an enamel, a, the same as the bolt A, and over this is placed a jacket, I), of metal made in proper shape to fit snugly over the bar. The screw-bolt D is provided with a head at one end and is screwthreaded at the other. Between the screwthreads and the head is applied the enamel a and jacket I). The jacket is to protect the enamel from being cracked off by a blow. The enamel will resist the best tempered saw or file, so that when protected as described it is impossible to sever the bolt or bar by any OLIVER It. BUTLER.

\Vitnesses:

HENRY L. HINMAN, G. M, JARVIS. 

